Motor-controller.



A. J. HORTON.

MOTOR CONTROLLER. APRLICATION HLED IAN. 2. 1918.

1,282,836.. Patented Oct. 29,1918.

a/wv /vd' i mm Howl m- 53 WW UNITED s ns ATENT OFFICE.

ALBERT J. HORTON, OF WHITE PLAINS, YORK, ASSIGNOR TO THE CUTLER- HAMMEB MFG. 00., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WIS- I CQNSIN. v I

MOTOR-CONTROLLER.

Patented Oct. 29, 1918.

Application filed January 2, 1918. Serial No. 209,823.

' as are commonly employed for light grind- In practice it is customary to employ shunt motors for such apparatus, and to control the same solely; by field regulation. Thus no provision is made for reducing the armature current preparatory to stopping, and to handlethe armature current without undue arcing it has been customary to provide a snap switch for interruption of the motor circuit.

The present invention has among its objects to provide a simple andefficient controller for both field regulating and stopping purposes which ,will obviate the necessity of using either a special stopping switch or special current reducing means.

A further object is to provide a controller of the aforesaid character which will include a portion of the field resistance in the armature circuit preparatory to stopping. A I I A further object is'to provide a controller. which will include a portion ofthe field resistance in the armature circuit for both starting and stopping and which will insure removal of such resistance from the arma ture circuit prior to inclusion of any resistance in the field circuit.

The accompanying drawing illustrates diagrammatically one embodiment of the invention which will now be described, it being understood that the embodiment illus trated issusceptible. of modification without departing from the scope of the appended claims.

The controller is shown in connection with a motor 1 having an armature A and a shunt field winding F and said controller includes a resistance R controllable by a pivoted contact arm 2 and cooperating, contacts 3 to 10 inclusive.

More particularly resistance R has its left hand terminal connected to contacts 5 and 6 and is divided into sections by contacts 7 to 10 inclusive. Contacts 3 and 4-. are connected by conductors 11 and 12 to contacts 9 and 10 respectively and the former contact is engaged by contact arm 2 when said arm is in engagement with contact 5, while the latter contact is engaged by contact arm 2 when said arm is in engagement with any of contacts 6 to 10 inclusive.

Contact arm 2 is shown in off position and movement of the same into engagement with contacts 3 and 5 establishes starting connections for the motor 1. The armature circuit of the motor then extends from line L through contact arm 2 to contact 3 by conductor v11 to contact 9 through the extreme right hand section of resistance R, by conductor 12 to contact 4, by conductor 13 to and through armature A to line L. The field circuit of the motor then extends from line L through contact arm 2 to contact 5, by conductor 14 to and through field F to line L. The motor thus starts with full field strength and with the current in its armature circuit reduced by one section of the resistance R.

Movement of contact arm 2 into engagement with contacts 4 and 6 establishes running connections for the motor, the right hand section of resistance B being then removed from the armature circuit of the motor while full current is still maintained in its field circuit. The armature circuit of the motor then extends from line L through arm 2 to contact 4 by conductor 13 to and through armature A to line L, while the field circuit remains the same as above traced with the exception that it is now completed by engagement of contact arm 2 with contact 6. Movement of contact arm 2 into engagement with contacts 7 to 10, progressively includes the sections of resistance R in the field circuit to weaken the field of the motor and thereby increase the speed thereof.

Return of contact arm 2 toward starting position excludes all sections of the resistance R which may be in the field circuit of the motor and in starting position of the contact arm all of resistance R is excluded from the field circuit and the right hand section of the resistance R is again included in the armature circuit. The right hand section of resistance R reduces the current in the armature circuit of themotor to such a valuethat'the contact arm 2 can be'moved' to 011 position without the occurrence of undue arcing between the same and contacts 3 and 5.

Obviously the connections might be modified for'i'nclusion of any desired amount of the field resistance in the armature circuit.

What I claim as new and desire to secure by Letters Patent is:

1. The combination with a motor having a shunt field, of a resistance, connections for'i-ncluding said resistance in the shunt field circuit of said motor for speed regulation, connections for including said resistance in the armature circuit of said motor for cur rent reduction and means controlling the continuity of the motor circuit and further controlling said second mentioned connections to include said'resistance in the armature circuit preparatory to interrupting the; latter.

2. The combination witha motor having a shunt field, of a resistance, connections for including said resistance in the shunt field circuit of said motor for speed regulation, connections for including said resistance in the armature circuit of said motor for current reduction, and means controlling the continuity of the motor circuit and further controllingsaid resistance, connections to insure inclusion of said resistance in the armature circuit and exclusion of the same from the field circuit of said motor preparatory to interrupting the circuit of said Inotor and for restarting said motor.

3. The combination with a motor having a shunt field winding, of a resistance, connections for including said resistance in the shunt field circuit of said motor for speed regulation, connections for including a portion of said resistance in the armature circuit of said motor for current lGflIlCtlOfi, and common means controlling the motor circuit and said resistance connections to insure exclusion of all of said resistance from the field circuit and inclusion of said portion of saidresistance in the armature circuit'of said motor preparatory to interrupting the circuit of said motor and for restarting said motor.

4:. The combination with motor having a shunt field, of shunt field resistance, a manual device controlling the continuity of Copies of this patent may be obtained for five cents each, by addt'efl'infiflle Washington, D. 0;

the motor circuit and operable to vary said resistance in the shunt field circuit of said motor for speed regulation nd connections controlled by said device for including a portion of said field resistance in the armature circuit of said motor preparatory to interruptingthe motor circuit. y

5. he combination with a mbtdrl'iaving a shunt field, of'a' shunt field resistance, a manual device controlling the continuity of the motor circuit and operable to vary said resistance in the field circuit of said motor for speed regulation and connections controlled by said device whereby" a' portion of said resistance is included in the atrium ture circuit ofsaidmo'tor rim tointerr'up tion of the circuit of said motor and also upon reestablishment thereon-said portion of said resistancebeing excludedfrom the arms'oiturecircuit of said motor" prior to clu'si'on of any' of'sa'i'd resistance in the field circuit of said motor'.

6: The" combination with a motor having a shunt field,- of a shunt field resistance, a series of contacts dividing said resistance into steps, a contact member o'ofiperat'ing with said: contacts te-vary resistance" in the shunt field circuit or said motor for sEeed regulation, and other contacts on making and brea n'g the motor circuit for including a portion of said resistance in the armatureeircuit of said motor for cur rent reduction, preparatory to breaking; of the motor circuit. r a

7. The combination with a, motor having a shunt field, of a shunt field resistance, a seriesof contacts dividing said resistance into steps, a Contact mm'bdi "'r'stin nwith Said contacts to 's'lii'd resistance in the shunt field- 'circuit of said motor for speed regulation, and other Contacts engageable and disengageable said for making and breaking the motor circuit for cluding a portion of said resistance inthe armature circuit" of said motor for current reduction,- preparatory to breaking of the motor circuit and also upon reestablishment thereof, said portion of said resistance Being excluded from the armature circuitoi said motor priorto' inclusion of any of said resistance in the field circuit of saidmotor.

In witness whereof, I have subscribed m name. I

ALBERT J. HORTON.

. s a le and disenga'lgceable by said member for Rio its 

